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What is DPKG_ROOT? And what is it not?

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What is DPKG_ROOT? And what is it not?
DebConf22

A while ago `dpkg` gained a switch `--force-script-chrootless` and started setting a variable `DPKG_ROOT` when executing maintainer scripts. How does this work precisely? Why is it needed and under which circumstances? Why is it a `--force` flag? What changes are needed in packages to add support? Which packages should support it? How about backwards-compatibility? These questions are to be answered by this talk.

Speakers: Helmut Grohne